Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Tampa Bay, FL

March 30, 2021Sumter County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Mar 30, 2021, 6:48 PM EDT for Sumter County, Florida. It was in force for 27 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 30, 2021, 6:48 PM EDT (22:48 UTC)
Expired: Mar 30, 2021, 7:15 PM EDT
In force: 27 min
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Sumter County, FL

The radar

The Tampa radar (KTBW), 123 km from the middle of the area, began a volume at 22:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Mar 30, 6:50 PM EDT	TSTM WND DMG	5 S Coleman, FL	EMERGENCY MANAGEMENT REPORTED SHERIFF DEPUTY OBSERVED A DOWNED TREE AS WELL AS SOME DOWNED ELECTRICAL LINES ON CR-528. HAIL OF UNKNOWN SIZE WAS ALSO OBSERVED. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 10.8 hours before the alert went out and 123 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1096 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 780 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

613 
WUUS52 KTBW 302248
SVRTBW
FLC119-302315-
/O.NEW.KTBW.SV.W.0004.210330T2248Z-210330T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tampa Bay Area Ruskin FL
648 PM EDT Tue Mar 30 2021

The National Weather Service in Ruskin has issued a

* Severe Thunderstorm Warning for...
  East central Sumter County in central Florida...

* Until 715 PM EDT.

* At 648 PM EDT, a severe thunderstorm was located near Bushnell,
  moving northeast at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Lake Panasoffkee, Sumterville and Adamsville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2884 8198 2875 8195 2874 8196 2871 8196
      2863 8204 2874 8216
TIME...MOT...LOC 2248Z 216DEG 5KT 2875 8206 

HAIL...1.00IN
WIND...<50MPH
 
$$

TBW

1 follow-up statement

415 
WWUS52 KTBW 302314
SVSTBW

Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
714 PM EDT Tue Mar 30 2021

FLC119-302323-
/O.EXP.KTBW.SV.W.0004.000000T0000Z-210330T2315Z/
Sumter FL-
714 PM EDT Tue Mar 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SUMTER COUNTY
WILL EXPIRE AT 715 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However pea size 
hail and heavy rain are still possible with this thunderstorm.

LAT...LON 2884 8198 2875 8195 2874 8196 2871 8196
      2863 8204 2874 8216
TIME...MOT...LOC 2313Z 216DEG 5KT 2878 8204 

$$

TBW

The office that day

Everything else NWS Tampa Bay, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 29, 10:04 PM EDT	Areal Flood Advisory	TBW	Hillsborough	116 min
Mar 30, 6:43 PM EDT	Special Weather Statement	TBW	Sumter	32 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.